java代码

import java.util.Scanner;

public class Main {
    static int N = 1000;
    static int[][] A = new int[N][N];
    static int[][] B = new int[N][N];
    static int[][] C = new int[N][N];
    public static void main(String[] args) {
        Scanner in =new Scanner(System.in);
        int n = in.nextInt();
        int m = in.nextInt();

        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= m; j++)
                A[i][j] = in.nextInt();

        int p = in.nextInt();

        for (int i = 1; i <= m; i++)
            for (int j = 1; j <= p; j++)
                B[i][j] = in.nextInt();

        for (int i = 1; i <= n; i ++) 
            for (int j = 1; j <= p; j++)
                for (int k = 1; k <= m; k++) {
                    C[i][j] += (A[i][k] * B[k][j]);
                }

        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= p; j++) {
                System.out.print(C[i][j] + " ");
            }
            System.out.println();
        }
        in.close();
    }
}